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Course: OCR A Level Physics A H556
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Curriculum

OCR A Level Physics A H556

1. Development of Practical Skills in Physics

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2. Foundations in Physics

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3. Forces and Motion

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4. Electrons, Waves and Photons

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OCR H556 chapter questions and answers

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Quiz

4.1.4 Current in a Current Carrying Conductor – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
In I = nAvq, n is
number of atoms per kg
number of electrons in the wire
number of carriers per unit volume
charge per carrier
2.
Doubling the cross-sectional area, with fixed current, the drift velocity
doubles
halves
is unchanged
quadruples
3.
Compared with copper, a semiconductor has
smaller n
larger n
the same n
no charge carriers
4.
A 2.0 A current in a wire with nAe = 1.0 × 10¹⁰ C m⁻¹ gives v =
2.0 × 10¹⁰ m s⁻¹
5.0 × 10⁻¹¹ m s⁻¹
2.0 m s⁻¹
2.0 × 10⁻¹⁰ m s⁻¹
5.
Heating a thermistor (semiconductor) increases n so its resistance
rises
stays constant
falls
becomes infinite
6.
An insulator has a very small
A
n
q
I × t
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Part of 4. Electrons, Waves and Photons — see every lesson and quiz in this unit.
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